Thx. I had used the drivers on the CD that came with my Logitech wireless keyboard to install the software (not actually a driver) that shows the NumLock and CapsLock indicators in the system tray (they evidentally forgot to include the LEDs on the keyboard). When I installed the new program off their website, I got 2 instances of the program running at startup, leading me to believe that the old one and new one were trying to run at the same time. I uninstalled what I'd just installed and then reinstalled it and now only one shows up.
The website never mentioned removing the old software first, but I guess they should have, huh?